one hours for 5 quiz, check the link https://blog.svpino.com/2015/05/07/five-programming-problems-every-software-engineer-should-be-able-to-solve-in-less-than-1-hour

5_in_one_hour.py

# 1.py
# coding: utf-8

def sum1(a):
    sum = 0
    for i in a:
        sum += i
    return sum

def sum2(a):
    sum = 0
    i = 0
    while i < len(a):
        sum += a[i]
        i += 1

    return sum

sum = 0
def sum3(a, step):
    global sum
    if step >= len(a):
        return sum

    sum += a[step]
    sum3(a, step + 1)

if __name__ == '__main__':
    a = range(5)
    print sum1(a)
    print sum2(a)
    sum3(a, 0)
    print sum

# 2.py    
def chainIt(a, b):
    result = []
    i = 0
    j = 0

    while i < len(a) and j < len(b):
        result.append(a[i])
        result.append(b[j])
        i += 1
        j += 1

    if i < len(a):
        result.extend(a[i:])

    if j < len(b):
        result.extend(b[j:])

    return result

if __name__ == '__main__':
    a = ['a', 'b', 'c']
    b = [1, 2, 3]
    print chainIt(a, b)

    a = ['a', 'b']
    b = [1, 2 ,3]
    print chainIt(a, b)
    
# 3.py
def fab(n):
    a = 0
    b = 1

    if n == 1:
        print a
    if n == 2:
        print b

    print a
    print b

    for i in range(3, n + 1):
        b = a + b
        a = b - a
        print b

if __name__ == '__main__':
    fab(10)

# 4.py
def max_number(a):
    b = [str(i) for i in a]
    str_list = sorted(b, reverse=True)
    num_str = ''.join(str_list)
    return int(num_str)

if __name__ == '__main__':
    a = [50, 2, 1, 9]
    print max_number(a)
        
    
# 5.py
def count(str, pos):
    if str.find('9') < pos - 1:
        return 
    
    if eval(str) == 100:
        print str
        return

    str = str[:pos] + '+' + str[pos:]
    count(str, pos + 2)
    str = str[:pos] + str[pos+1:]

    str = str[:pos] + '-' + str[pos:]
    count(str, pos + 2)
    str = str[:pos] + str[pos+1:]

    count(str, pos + 1)

if __name__ == '__main__':
    s = '123456789'
    count(s, 1)
    
        
    

solved these in 45 mins, Q4 is a little tricky, Q5 is just normal backtrace one that I spent 20mins...